it would be nice to have the capability to show incoming sms; I don't believe that is so important being able to write down them in a car, but reading would be really useful

I agree... My car has integrated bluetooth handsfree on the factory radio... It shows who's calling and allows me to make calls from the OEM touchscreen... Supposedly it also has outgoing sms and phonebook, but these two features dont work on my setup because they need a special phone/firmware and also a cradle to connect the phone phisically to the car...

Anyways, all this to say that I often drive with the phone in my trousers pocket, and dont bother to get it out, but when an incoming SMS arrives it is a PAIN to get the phone sitting down...

Hence, SMS alert is very nice to have in the car

Also, a way of choosing easily (like a click-on-click-off button) whether you want to use audio gateway or not is very important...

In my car I need to select from the handset whether I want to use handsfree or not, and this is a pain when other ppl are in the car, everytime the phone rings the music mutes, and even worse whenever I make a call using the handset it still defaults to handsfree, so I need to wait until the call starts ringing so the "HANDSET" option popups up on my phone...